Fasciola hepatica: effect of the natural light level on cercarial emergence from temperature-challenged Galba truncatula

Open Access

Table 1.

Main characteristics of snail subgroups used in the two experiments. To induce thermal shock, Petri dishes containing snails were exposed to a mean of 12 °C for 3 h every week. TC: temperature-challenged snails.

Experiment, snail origin and number of snails	Characteristics of subgroups at day 30 post-exposure	Number of snails
Experiment, snail origin and number of snails	Characteristics of subgroups at day 30 post-exposure	At day 30	Releasing cercariae
Experiment A
Thenay (200)	Controls kept indoors at 20 °C under a 3000-lux artificial light	48	37
Thenay (200)	TC snails subjected to a thermal shock outdoors under:
	a constant artificial light of 3000 lux^*	49	33
	natural light^*	49	39
Experiment B
Chitray (200)	Controls kept indoors at 20 °C under a 3000-lux artificial light	43	30
Chitray (200)	TC snails subjected to a thermal shock outdoors under:
	a constant artificial light of 3000 lux^*	43	37
	natural light^*	44	34

Chitray (300)	TC snails subjected to a thermal shock indoors under a constant artificial light level of:
	600 lux^*	39	29
	1200 lux^*	39	33
	1800 lux^*	39	38
	2400 lux^*	39	32
	3000 lux^*	39	35

The rest of the week, the TC snails of the nine subgroups were placed indoors at a constant temperature of 20 °C as for controls.

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